I see the value of these sites loading almost instantaneously on any device and connection, but other than the novelty value. I don’t see anything else.

Not digging into the actual load speed by ms or even the number of bytes loaded. Just using my human perception of loading times, I cannot see any difference between apple.com (I assume is one of the worst offenders, if not at the very least doesn’t make the 10KB club) and the sites listed in this site.